It looks like IMS is waiting for a cold / warm restart, which would explain the "blank" screen when choosing IMS from the Vtam/loging screen
http://dtsc.dfw.ibm.com/MVSDS/%27HTTPD2 ... 0001%29%27
Starting IMS 10.1
First you will need to start IRLM for IMS 10.1 (If your entering the
commands from the SDSF log you will need to put a "/" in front of the commands)
S IMS10RL1
The proc should match which ever version of IMS your starting You should see
the following message in the SDSF log or on MVS console:
DXR117I IRLM001 INITIALIZATION COMPLETE
Next you will need to stat the IMS control region S IMS10CR1
The proc should match which ever version of IMS your starting. You should see
the following message in the SDSF log or on MVS console: The message
will show up as an outstanding message (the message should display white)
*## DFS810A IMS READY (## will be some number)
You will need to reply to this message
r ##,/NRE CHKPT 0 FORMAT ALL (this will cold start IMS)
OR
r ##,/NRE (this will warm start IMS)
You should see the following message in the SDSF log or on MVS
console:
DFS994I COLD START COMPLETED.
OR
DFS994I WARM START COMPLETED.
Once IMS is started it will kick off a task to start the message
processing regions. This will take a couple of minutes.
**NOTE If IMS requires an emergency restart you will need to look in
the IMS V10 Operations Guide for examples